Compressors, Gas Turbines And Jet Engines MCQ Questions & Answers

Compressors, Gas Turbines And Jet Engines MCQ Questions & Answers | Mechanical Engineering

Learn Compressors, Gas Turbines And Jet Engines MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Compressors, Gas Turbines And Jet Engines MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-7 section-3

In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as

A) Work factor B) Slip factor C) Degree of reaction D) Pressure coefficient

Discuss

Answer & Solution

Answer: Option C

Solution:

In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as degree of reaction

A rocket engine for the combustion of its fuel

A) Carries its own oxygen B) Uses surrounding air C) Uses compressed atmospheric air D) Does not require oxygen

Discuss

Answer & Solution

Answer: Option A

Solution:

A rocket engine for the combustion of its fuel Carries its own oxygen

The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as

A) Compressor efficiency B) Volumetric efficiency C) Isothermal efficiency D) Mechanical efficiency

Discuss

Answer & Solution

Answer: Option B

Solution:

The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as volumetric efficiency

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than

A) 2 kg/cm² B) 6 kg/cm² C) 10 kg/cm² D) 14.7 kg/cm²

Discuss

Answer & Solution

Answer: Option A

Solution:

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than 2 kg/cm².

In a centrifugal compressor, an increase in speed at a given pressure ratio causes

A) Increase in flow B) Decrease in flow C) Increase in efficiency D) Increase in flow and decrease in efficiency

Discuss

Answer & Solution

Answer: Option D

Solution:

In a centrifugal compressor, an increase in speed at a given pressure ratio causes Increase in flow and decrease in efficiency

The clearance volume of the air compressor is kept minimum because

A) It allows maximum compression to be achieved B) It greatly affects volumetric efficiency C) It results in minimum work D) It permits isothermal compression

Discuss

Answer & Solution

Answer: Option B

Solution:

The clearance volume of the air compressor is kept minimum because It greatly affects volumetric efficiency

Which is false statement about multistage compression?

A) Power consumption per unit of air delivered is low B) Volumetric efficiency is high C) It is best suited for compression ratios around 7 : 1 D) The moisture in air is condensed in the inter-cooler

Discuss

Answer & Solution

Answer: Option B

Solution:

- Power consumption per unit of air delivered is low
- It is best suited for compression ratios around 7 : 1
- The moisture in air is condensed in the inter-cooler

The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

A) Heated B) Compressed air before entering the combustion chamber is heated C) Bled gas from turbine is heated and readmitted for complete expansion D) Exhaust gases drive the compressor

Discuss

Answer & Solution

Answer: Option B

Solution:

for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is Compressed air before entering the combustion chamber is heated

If the flow of air through the compressor is parallel to its axis, then the compressor is

A) Reciprocating compressor B) Centrifugal compressor C) Axial flow compressor D) Turbo compressor

Discuss

Answer & Solution

Answer: Option C

Solution:

If the flow of air through the compressor is parallel to its axis, then the compressor is axial flow Compressor

Surging is the phenomenon of

A) Air stream blocking the passage B) Motion of air at sonic velocity C) Unsteady, periodic and reversed flow D) Air stream not able to follow the blade contour

Discuss

Answer & Solution

Answer: Option C

Solution:

Surging is the phenomenon of Unsteady, periodic and reversed flow Turbocharger surging is a phenomenon, which affects the performance of the turbocharger and reduces its efficiency.